Rivet analyses referenceJADE_1987_I234905Measurement of $R$ for energies between 12 and 46.47 GeVExperiment: JADE (PETRA) Inspire ID: 234905 Status: VALIDATED Authors:
Beam energies: (6.0, 6.0); (7.0, 7.0); (11.0, 11.0); (12.5, 12.5); (13.8, 13.8); (15.0, 15.0); (15.2, 15.2); (15.6, 15.6); (16.9, 16.9); (17.2, 17.2); (17.5, 17.5); (17.7, 17.7); (18.2, 18.2); (20.2, 20.2); (20.6, 20.6); (21.3, 21.3); (21.8, 21.8); (22.2, 22.2); (22.8, 22.8); (23.2, 23.2) GeV Run details:
Measurement of $R$ in $e^+e^-$ collisions for energies between 12 and 46.47 GeV. The individual hadronic and muonic cross sections are also outputted to the yoda file so that ratio $R$ can be recalculated if runs are combined. Source code: JADE_1987_I234905.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/FinalState.hh"
4
5namespace Rivet {
6
7
8 /// @brief R measurement
9 class JADE_1987_I234905 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(JADE_1987_I234905);
14
15
16 /// @name Analysis methods
17 /// @{
18
19 /// Book histograms and initialise projections before the run
20 void init() {
21 // Initialise and register projections
22 declare(FinalState(), "FS");
23 // counters for R
24 book(_c_hadrons, "/TMP/sigma_hadrons", refData<YODA::BinnedEstimate<string>>(1,1,1));
25 book(_c_muons, "/TMP/sigma_muons" , refData<YODA::BinnedEstimate<string>>(1,1,1));
26 for (const string& en : _c_hadrons.binning().edges<0>()) {
27 double end = std::stod(en)*GeV;
28 if(isCompatibleWithSqrtS(end)) {
29 _ecms = en;
30 break;
31 }
32 }
33 if(_ecms.empty()) MSG_ERROR("Beam energy incompatible with analysis.");
34 }
35
36
37 /// Perform the per-event analysis
38 void analyze(const Event& event) {
39 const FinalState& fs = apply<FinalState>(event, "FS");
40
41 map<long,int> nCount;
42 int ntotal(0);
43 for (const Particle& p : fs.particles()) {
44 nCount[p.pid()] += 1;
45 ++ntotal;
46 }
47 if(nCount[-13]==1 and nCount[13]==1 && ntotal==2+nCount[22]) {
48 // mu+mu- + photons
49 _c_muons->fill(_ecms);
50 }
51 else {
52 // everything else
53 _c_hadrons->fill(_ecms);
54 }
55 }
56
57
58 /// Normalise histograms etc., after the run
59 void finalize() {
60 BinnedEstimatePtr<string> mult;
61 book(mult, 1, 1, 1);
62 divide(_c_hadrons,_c_muons,mult);
63 }
64
65 /// @}
66
67
68 /// @name Histograms
69 /// @{
70 BinnedHistoPtr<string> _c_hadrons, _c_muons;
71 string _ecms;
72 /// @}
73
74
75 };
76
77
78 RIVET_DECLARE_PLUGIN(JADE_1987_I234905);
79
80
81}
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